package com.atguigu.gulimall.product.service.impl;

import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collector;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //1、查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);

        //2、组装成父子的树形结构
        //2.1找到所有的一级分类
        List<CategoryEntity> collect = entities.stream().filter((categoryEntity) -> {
            return categoryEntity.getParentCid() == 0;
        }).map((categoryEntity)->{
            categoryEntity.setChildren(getchildren(categoryEntity,entities));
            return categoryEntity;
        }).sorted((categoryEntity1,categoryEntity2)->{
            return categoryEntity1.getSort()==null?0:categoryEntity1.getSort()-(categoryEntity2.getSort()==null?0:categoryEntity2.getSort());
        }).collect(Collectors.toList());
        return collect;
    }



    public List<CategoryEntity> getchildren(CategoryEntity root,List<CategoryEntity> all ){
        List<CategoryEntity> collect = all.stream().filter((categoryEntity) -> {
            return root.getCatId() == categoryEntity.getParentCid();
        }).map((categoryEntity) -> {
            categoryEntity.setChildren(getchildren(categoryEntity, all));
            return categoryEntity;
        }).sorted((m1, m2) -> {
            return m1.getSort() == null ? 0 : m1.getSort() - (m2.getSort() == null ? 0 : m2.getSort());
        }).collect(Collectors.toList());

        return  collect;
    }

}